//很简单
#include <iostream>
#include <algorithm>
#include <cmath>
using namespace std;
int sum;int main() {
	int n;cin >> n;
	while (n != 1) {
		sum = sum + 1;
		if (n % 2 == 1)
			n = n * 3 + 1;
		else n = n / 2;
	}cout << sum;return 0;
}